Test whether topics reviewed for one path reduce the work needed for later paths. For successive targets, record existing topics reused, new topics added, review hours, model use and corrections found in reused material. Include maintenance and coordination in the comparison. Reuse helps only when the earlier material fits the new group and task. Costs may stay high when domains overlap little or older explanations need substantial repair. Count avoided work and observed quality together, rather than treating a growing node count as an economic advantage.